San transfer mode

Hi

Master & media Solaris 10, NBU 7.6.0.3

Backup host : Windows 2008 R2, NBU 7.6.0.3, Physical host, San connectivity

VM client : windows 2008 server

Backups for this one client is failing with error 6 "Error bpbrm(pid=20754) from Client: ERR - Error opening the snapshot disks using given transport mode: Status 23"

when I changed the mode of the transfer to nbd this backup worked, But this backup should be running via SAN transport mode.

Please suggest.